Pneumatic weaving method



y 1951 R. WILLE ETAL 2,982,315

PNEUMATIC WEAVING METHOD Filed Sept. 3, 1957 4 Shets-Sheet 1 Fig. 7

Fig.2 .76 75a 75b 15c 25 INVENTORS RUDOLF' WILLE JOHANNES KLEIN BY I WLUQ

ATTO RN EYS May 2, 1961 Filed Sept. 3, 1957 R. WILLE ET AL PNEUMATIC WEAVING METHOD 4 Sheets-Sheet 2 Fig. 3

l\ VENTORg RUDOLFWILLE.

JOHANNES KLEIN BY fi JW MmZrL-M Afro RN EYS May 2, 1961 R. wlLLE- ETAL 2,982,315

PNEUMATIC WEAVING METHOD Filed Sept. 5. 1957 I 4 Sheets-Sheet :s

Fig. 5

34 V 'i INVENTORS RU DBL-F WILL-E JOHANNES KLEIN ATTORNEYS May 2, 1961 R. WlLLE ETAL 2,982,315

PNEUMATIC WEAVING METHOD Filed Sept. 3, 1957 4 Sheets-Sheet 4 RdboLF .WILLE JOHANNES KLEIN ATTORNEYS 5 .3 A p 'PNEUMATIC wEAvm Martian Rudolf wine, 52 Man a Isti, neat disasters, Germany, and JohannesKlein, 2 Ha'i-lifigeibdr Weg, Berlin-Charlattenburg, Germany 1 "File Sept. 3, 195 ;amne ty: claims. '(CL13'9-1'27) The n rethod of air blastpicking of theweft threads is, in general, already known in the weaving technique. As ycompared with the normal shuttle loorn the pneumatic weaving process has the advantages of a remarkable increase of shot frequency, whereas at the same time .the noise level is lowered to a great ,extent Moreover, the blowing method even -allows weaving of thin weft threads, e.g. monofils, or of thickerthreads ofupoor strengthvpr of small twist which could not rbewovemwith a shuttle; Pneumatic picking 'devices, known up tillnow, make use of the frictional forceslaszperformed by an air jet on a thread-carried along in the core of the saidiiet;

The disadvantageof this methqdyhowevemis that the tangential forces active on the thread are onlyl-weak as the thread only .oifersv a small surface area and as the coefiicient of drag of the thread boundary layer isJof no great value. For this reason, .auxiliarytmeans for increasing the friction have been used as for instance the addition to the air blastof atomized water or powder.

The main object o f our invention is an improvement of the pneumatic picking process and a more 'efi'ective' use of the air blast energy. y t t A further object of our invention is the improvement of the attack of the air-flowforces on the vweft thread.-

Another object of our invention is to oifer temporarily. increased resistance of flow at the free end of the weft thread. t x J More in detail our invention consists in a method .to

arrange the forward end of the weft thread normally to the direction of the airnblast. This can be put into practice by placing the said& endqof the Weft threaduinthe form of a loop across the orifice of the blowing nozzle. 1 -A preferred embodiment of our invention provides that the free end of the. loop of the weft thread is fastened fat the timedof: the b'eginningair :bl'ast, and,;is-

then released so that it may uncoil in the direction of the-:shot.. v

7 Still another object: of our inventionis a mechanical device adapted to realize the aforementioned method. Thisdevice offers the special feature that the blowing nozzle is in coordination with a deflecting mechanismwhich draws the forward end of the weft thread across the orificefof the blowing nozzle.

v v ,a d o th er characteristics of bur invehtion be explained more in detail in "connection with the draw gs-l United States mo when the (vein thread starts case, er a w supported on by ball bearings 30 and31. "The rear end ofthe'r with atlateral'bore 34 more or less inclined fto the" jFigur e 'i 'shov'vi's a modification of the thread guide nmrzmmrsgu .on l ine C-D of Figure 3.

'Figure fii gives grammatic side elevation of as a controlm'echanism for the clamping element for the weft thread. 7 I p a F g re L s a p a view o -Fi re a or Figures it and 9representdiagrammatically:two phases of the fastenin g arniawert thread; 1

a a of 'q m tes a di ar e in ib n rr w-r, tT tw t rs tlal l l as lfih 9 1 int d ec ion O ..the said arrow, is ar n ged in the forn of aloop 14 runninglacrbssdhe directipn of the "air jet in front of t e le elm 9 t t ha qr e of hq' mb a are jactihg perpendicularly to the-argisof the, thread. v be propelled its forward 611d is,fastened o r secnred'respectively by a clamping element IQ as indicated scheinatically in Figs. 1 and 2. The loop 14'is 'thus gradually widened up and stretched by the ,air jet as indicated ,by the dotted lines 14 1 and 14b VinFig.. 1,. After {a certain growth of the loop 'l t the clampin'gelement-ldreleases the free end 15 of the weft thread lnflwhichnnow can u nco il the direction? of "the shot, as indicated by thephases 15a,-15b, in

of h flqfit end of ,thejwefft' thread {rntiyes with increasing I accelerationfthi'ough'the sh ed 'of warp threadsyju st as in the hip a k-t a r Fig. SQ shtiyVs'fthe ea thread12 as de'livere'd frorna' cross. rotind hohbin 17.. Aiconveyer belt IS running overj two drnms l9and 20br'ings the weft thread to thet nozzlell, an eye 21fserves 'for guidihg thefthread j'lfhe drum 20 is gqrtven b the "n ,drive offthe lo'ornwhefe-t as fduin' 1? turhs -freely. A sp" 'ngsiipported r0 2,

ft th a ,shaft 23, :is guiding the t t .4 t n on dru mangle or;

reyolyi'ng continuously I valve is fitted with a gear wheel 32, thedr'iveof which description. From thecros s sectionf l as shown'injr' i g '4 i how thef t dI JeI a ila fc atn t. municate ozzle 11 during the relevant pc'xsmons o-f thechannels zsiand '29 of valve 27. U

'Whereas in Fig; 3 the weft thread 12 an axial bore 33 of valve body 27tothe nozzlell; Fig. 5 presents a solution whereintheLhousing 24j isfproyided of thel rioz'zle {11, the weft thread 12 being carried throu gh said bore "34to the 'frontof -thefnozzle 11. y

ed tlirea'd efnd ;is decreasing so "that the free i the weft thread 'lwhich fisf gear wheel 32 of the rotary slide yalve engages a pinion 35 which again communicates through a bevel gear drive 36 with a shaft 37. The saidshaft carries acam plate 38 which cooperates with the roller 39 of av rack 40. The rack 40 which may be shifted back to its starting position by the spring 41 mates a toothed segment 42 controlling the clamping element 16 as shown schematically in Figs. 1 and 2.

Owing to the fact that the rotary valve 27 is positively connected by way of the parts 32. 36. 38 and 40 to the toothed segment 42, the clamping element 16 works in synchronous rhythm with the nozzle 11. Accordingly. if the rotary slide valve reaches its position shown in Fig. 4' and if the weft thread 12 is positioned in front of the nozzle 11 as appearing from Fig. l the weft thread. following the various phases shown in Fig. 2, will be blown into the open shed where the reed 43 heats up the weft. At the side of the tissue opposite to the nozzle. 11 the weft thread is bound up immediately after the beat, a gauze weave may aid this process. i In the course of the process as described before the clamping element denoted by 16 in Fig. l, operates as follows: I

- The toothed segment 42 is supported by a shaft 45. This shaft also carries a clamping cam 46 co-ordinated with a cutting edge 47. In the drawing the said cam isshaped as a double sided clamping element. Oppositeto and in the trajectory of the clamping cam 46, a spring biased abutment or support 49 is pivoted to a bracket 48 of the nozzle housing 24. if now the cam disc 38, in the rhythm of the rotation of the valve 27, pushes forward the rack 40 against the spring 41, and ifthe clamping cam 46 by way of the toothed segment 42 is turned upwards (see Fig. 6), the weft thread 12. as shown in Fig. 8 will be drawn against the spring support 49 where it is finally clamped between the parts 46 and 49 in a position as shown in Fig. 9, whereby the loop 14 demonstrated in Fig. l is formed. In the course of thesweeping movement the blade 47 cuts off the rearward end of the weft thread blown into the shed. This cycle of operations will be repeated at each 180 turn of valve 27 and at each corresponding shift of the gear rack 40. In the position as being shown in Figs. 1 and 9 respectively, the weft thread is attacked by the air blast and will be driven through the shed in the way shown in Fig. 2 whereafter it is cut at its rear end.

1 In the case of the clamping element being formed as a double sided cam (Fig. 6), the loop formation occurs by turns to both sides across the nozzle 11; .It is understood, however, that the arrangement can also be made insuch a way that the clamping element forms the loop always in one and the same direction.

,l The pneumatic thread-picking apparatus, as being shown in the drawings, can be arranged at both sides of the loom.

' Moreover, it is to be mentioned that the feeding of the weft thread from the bobbin to the nozzle as well as the control of the nozzle itself cou d be constructed otherwise than in the manner shown in the drawings, without departing from the spirit of the invention.

What we claim is:

' 1. A device for pneumatic picking of weft threads comprising a nozzle for the discharge of compressed air it) the direction of the shot, controlling means for the periodic delivery of compressed air to the nozzle, means for bringing up the weft thread to the nozzle and a deflecting mechanism adapted to draw the free end of the Weft thread across the air nozzle.

' 2. A device for pneumatic picking of weft threads comprising a nozzle for the discharge of compressed air.

in the direction of the shot, controlling means for the periodic delivery of compressed air to the nozzle, thethe weft thread extending from said bore across the path of the air discharge from the nozzle.

3. A device for pneumatic picking of weft threads comprising a nozzle for the discharge of compressed air in the direction of the -shot, controlling means for the periodic delivery of compressed air to the nozzle, a guide channel for the weft thread said channelending near the air nozzle, means for bringing up the weft thread to the nozzle and deflecting mechanismadapted to draw the free end of said weft thread across the air nozzle.

4. A device according to claim 1 wherein the said defiecting mechanism comprises a clamping element.

' 7. A device for pneumatic picking of weft threads comprising a nozzle for the discharge of compressed air in the direction of the shot, a rotary valve for the periodic delivery of compressed air to the nozzle, means for bringing up the weft thread to the nozzle and a deflecting mechanism adapted to draw the free end of the said weft thread across the air nozzle.

Y 8. A' device for pneumatic picking of weft threads comprising a nozzle for the discharge of compressed air in the direction of the shot, a rotary valve for the periodic delivery of compressed air to the nozzle, means for bringing up the weft thread to the nozzle and a clamping element adapted to draw the free end of the said weft thread across the air discharge orifice, said rotary valve and said clamping element being coupled for synchronous action.

- 9. A device for pneumatic picking of weft threads comprising a nozzle for the discharge of compressed air in the direction of the shot, controlling means for the periodic delivery of compressed air to the nozzle, a

driving mechanism for the said controlling means, a

prises blasting a fluid jet in the direction of the shot and transversely against a weft thread arranged outside the warp shed across the path of the jet and by the force of the jet shooting the thread into the warp shed along said path in the form of a loop lengthening in said direction and extending within the shed across and along;

opposite sides of the jet.

11. A method of picking weft threads, which comprises blasting a fluid jet in the direction of the shot and transversely against a weft thread arranged outside the warp shed across the path of the jet and by the force of the jet shooting the thread into the warp shed along said path in the form of a loop extending across and alongopposite sides of the jet, and then by the force of the flying loop uncoiling the thread forming one side of the loop to whip that thread across the shed in the direction of the shot.

12. A method of picking weft threads, which cornprises blasting a fluid jet transversely against a weft thread arranged across the path of the jet and by the force of the jet shooting the thread into the warp shed in the form of a loop extending across and along opposite sides of the jet, and then by the force of the flying loop uncoiling the thread forming one side of the loop to whip that'thread in the direction of the shot, and thereafter severing outside the shed the thread that formed the other side of said loop. v

13. A method of picking weft threads, which com, prises arranging a free end portion of the weft thread across a shot path, and while holding the thread end in place hlastinga fluid jet in said path transversely against the thread to shoot the thread into the Warp shed in the form of a lengthening loop extending across and along the thread to shoot. the thread into the warp shed in the form of a lengthening loop extending across and along the jet, and then releasing said thread end so that said loop will uncoil to whip said end in the direction of the shot. I Y

15. A method of picking weft threads, which comprisesarranging a free end portion of the weft thread across a shot path, and while holding the thread end in place blasting a fluid jet in said path transversely against the thread to shoot the thread into the warp shed in the form of a lengthening loop extending across and along the jet, and then releasing said thread end so that said loop will uncoil to whip said end in the direction of the shot, and thereafter severing said thread outside the shed to obtain a new end for arrangement across said path.

References Cited in the file of this patent UNITED STATES PATENTS 1,096,283 Brooks May'12, 1914 1,426,351 Brooks Aug. 22, 1922 1,721,940 Ballou July 23, 1929 2,267,287 7 'M'oessinger Dec. 23, 1941 2,668,560 Svaty Feb. 9, 1954 2,796,085 Svaty et a1. June 18, 1957 

